Ventilation grill



FIG. 1 is a perspective view of a ventilation grill showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a side view thereof; and,

FIG. 5 is a front view, the rear view being exactly the same in appearance, thereof.

The broken lines depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a ventilation grill, as shown and described. 